d. Mary used to play volleyball better than now.

• This is the correct rephrasing of the original sentence, indicating that Mary's volleyball skills have declined.

d. Mary used to play volleyball better than now.

• This sentence correctly captures the idea that Mary’s current volleyball skills are not as good as they were in the past.

a. The joke that I told Henry made him laugh.

• This sentence correctly describes the effect of the joke on Henry.

d. I am responsible for looking after my children.

• This option accurately reflects the responsibility implied in the original sentence.

A. Error Identifying

1. I use the Internet to find out about the latest discoveries in drugs and developments in medically research.

• d. medically should be medical. Correct sentence: I use the Internet to find out about the latest discoveries in drugs and developments in medical research.

1. You may choose to stay with a host family or you may prefer to finding your own room or apartment.

• b. finding should be find. Correct sentence: You may choose to stay with a host family or you may prefer to find your own room or apartment.

1. They lived in the country, mile from the nearest station, so they actually pick me up by their car.

• c. mile should be miles. Correct sentence: They lived in the country, miles from the nearest station, so they actually pick me up by their car.

1. Researches in economics, psychology, and marketing can be business.

• a. Researches should be Research. Correct sentence: Research in economics, psychology, and marketing can be business.

1. Can you tell me why you are always coming to class so late?

• The sentence is correct. There are no errors.

B. Sentence Building

1. I am very concerned about my son's health.

2. I did not make out what was happening.

3. The house is on fire! Send for the Fire Brigade.

4. The boat turned over, throwing us all into the water.

5. The invention of the electric telegraph gave birth to the communications industry.

C. Sentence Rewriting

1. "Without the rapid growth in population, there would be fewer food shortages."

• He blamed the rapid growth in population for the increased food shortages.

1. You don’t have to have any previous experience to apply for the job.

• It’s not necessary to have any previous experience to apply for the job.

1. The ferry couldn’t sail because of the rough sea.

• The rough sea prevented the ferry from sailing.

1. "It certainly wasn’t me who took your card," said Bob.

• Bob denied having taken your card.

1. That question can’t be answered satisfactorily.